Smiles have an important role in human communication. They generally create positive impressions in social interaction. How does smile intensity affect the perception of facial attributes such as attractive, lively, altruistic, beautiful, or powerful impressions? Also, does dynamic presentation of smile have different effects from that of static presentation? We investigated perceptual changes of each facial attribute in dynamic and static presentation as a function of peak smile intensity controlled by morphing. The models were eight Japanese. The levels of peak smile intensity were selected from 0%, 30%, 60%, 90%, and 120%. The intensity of 0% corresponded to the neutral, while the intensity of 120% corresponded to the smile caricature. The patterns with one of the peak smile intensities were displayed statically, or presented after the static neutral faces sequentially. In the dynamic condition, the patterns were transformed continuously from neutral to the peak smile intensity. The total duration was 1033 ms in all conditions. The results indicate that the smile intensities and the presentation conditions affect the perception of each facial attribute differently. However, the overall rating scores of those attributes increased almost linearly up to 90%, but there was no large difference between 90% and 120% of smile intensity.

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by H Ishi, J Gyoba, M Kamachi

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